Intel Xeon E3 1278L v4 's Advantages
Released 9 months late
More modern manufacturing process (14nm vs 22nm)
Lower TDP (47W vs 120W)
Intel Xeon E5 2685 v3 's Advantages
Higher specification of memory (DDR3 vs DDR3)
Higher base frequency (2.6GHz vs 2GHz)
Larger L3 cache size (30MB vs 6MB)